研究目的
To study the degradation of eosin yellow dye using ZnO as a photocatalyst in a slurry reactor exposed to solar light, and to determine the optimum values of parameters such as catalyst concentration, catalyst type, and initial dye concentration affecting the degradation rate.
研究成果
The photocatalytic degradation of eosin yellowish dye using ZnO under solar light is effective for discoloration and mineralization. Optimal conditions include a catalyst concentration of 750 ppm, pH of 9, and initial dye concentration of 25 ppm, achieving high degradation rates. The catalyst showed stability and reusability with minimal activity loss after multiple cycles. Longer irradiation times are needed for complete mineralization, as indicated by COD reduction studies.
研究不足
The study is limited to specific conditions such as the use of solar light, which may not be consistent or available in all regions. The catalyst reuse was tested only up to four cycles, and the dissolution of ZnO at alkaline pH was negligible but could be a concern in other conditions. The experiments were conducted with fixed parameters like pH and temperature, which might not cover all possible industrial wastewater scenarios.
1：Experimental Design and Method Selection:
The study employed a solar light-irradiated slurry reactor for photocatalytic degradation of eosin yellowish dye using ZnO as the catalyst. The design involved varying parameters like catalyst concentration and initial dye concentration to optimize degradation efficiency.
2：Sample Selection and Data Sources:
Eosin yellowish dye solutions were prepared with concentrations ranging from 25 to 100 ppm using distilled water. ZnO powder from Merck Co. was used as the photocatalyst.
3：List of Experimental Equipment and Materials:
Equipment included an insulation-walled container (500 ml volume), magnetic stirrers for continuous stirring, a Double Beam UV-1800 spectrophotometer (Shimadzu) for absorption measurements, Millipore syringe filter paper (
4：45 μm) for sample filtration, and materials such as ZnO powder (Merck Co., Germany) and eosin yellowish dye (Merck, Germany). Experimental Procedures and Operational Workflow:
Suspensions of dye solution and photocatalyst (
5：25 l) were exposed to solar light with magnetic stirring. Samples were taken at different time intervals, filtered, and analyzed for absorption to monitor degradation. Temperature was maintained constant by wetting the reaction vessel with water. Data Analysis Methods:
Degradation efficiency was calculated using the formula: Degradation (%) = [(Abs0 - Abst) / Abs0] × 100, where Abs0 is initial absorption and Abst is absorption at time t. Kinetic studies used the equation Co/C = kt, and COD reduction was measured to assess mineralization.
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